Salary sacrifice pension changes: the £2k cap & 2029 rules

Since the 2025 Autumn Budget, news of salary sacrifice pension changes have prompted a wave of questions from employers, directors and employees. The headline figure – a new £2,000 cap – has caused understandable concern, but the reality is more nuanced.

This guide explains what the upcoming rules mean in practice, who is most likely to be affected, and what is not changing when the new measures take effect from 6th April 2029.

What is a salary sacrifice pension arrangement?

A salary sacrifice arrangement is a contractual agreement between an employer and an employee. The employee agrees to a lower contractual salary, and the employer provides a benefit instead. In this case, the employer will make pension contributions on the employee’s behalf.

For tax purposes, HMRC will only recognise an arrangement as salary sacrifice if:

• The employee gives up part of their contractual pay before it becomes payable, and
• The employment contract is formally amended to reflect the reduced salary and increased employer pension contribution.

Simply re-describing pay on a payslip or in payroll software is not sufficient. The contractual position must genuinely change.

When structured correctly, salary sacrifice has traditionally reduced both employer and employee National Insurance compared with an equivalent employee pension contribution.

Salary sacrifice pension changes from 6th April 2029

The government has introduced legislation to limit the National Insurance advantage available through salary sacrifice arrangements.

From 6th April 2029, NIC relief on salary sacrifice pension contributions will be capped at £2,000 per individual per tax year.

This change is contained in the National Insurance Contributions (Employer Pensions Contributions) Bill, published in December 2025.

How the £2,000 Cap Works

• The first £2,000 of salary sacrificed into a pension each year will remain free from Class 1 National Insurance.
• Any amount above £2,000 will be treated as earnings for Class 1 NIC purposes.
• Both employer and employee Class 1 NIC will apply to the excess.

Importantly, these salary sacrifice pension changes affect National Insurance only. The Income Tax treatment of pension contributions remains unchanged and continues to be governed by existing annual allowance rules.

This means salary sacrifice pension contributions are not restricted or prohibited. The NIC outcome simply changes once the £2,000 threshold is exceeded.

A simple example

An employee agrees to salary sacrifice £10,000 into their pension during the year.

• £2,000 remains fully exempt from National Insurance.
• £8,000 becomes subject to Class 1 NIC for both the employer and the employee.

The applicable NIC rates will depend on the legislation in force at the time, but the taxable amount is clear.

Who is most likely to feel the impact?

The upcoming changes will not affect everyone equally. Those most likely to notice a difference include:

• Employees sacrificing more than £2,000 per year into a pension, particularly higher earners.
• Individuals using salary sacrifice strategically to manage “adjusted net income” (for example, to preserve the personal allowance or Child Benefit).
• Employers who currently share their employer NIC savings with employees as part of the arrangement.

For employees making modest salary sacrifice contributions, the change may have little or no practical effect.

What about directors and owner-managed businesses?

The £2,000 cap is aimed specifically at salary sacrifice arrangements. These are situations where contractual earnings are given up in exchange for employer pension contributions.

In many owner-managed companies, pension contributions are made directly by the company, funded from company profits rather than from salary the director was contractually entitled to receive. In these cases, there may be no salary sacrifice at all.

Where no contractual earnings are being given up, the new NIC cap is unlikely to apply in the typical scenario. That said, the final position will depend on how the rules are implemented and whether any targeted anti-avoidance measures are introduced before 2029.

Careful review of how director remuneration and pension contributions are structured remains essential.

A practical note of caution

Although salary sacrifice can be tax-efficient, reducing contractual salary can have wider consequences beyond tax and NIC. These should always be considered before implementing or increasing a sacrifice arrangement. Potential knock-on effects include:

• Mortgage affordability. This is because some lenders assess income after sacrifice.
• Statutory payment, including  Statutory Maternity Pay (SMP) or Statutory Sick Pay (SSP). These may be calculated using post-sacrifice earnings depending on timing.
• Life assurance and income protection, where benefit levels are often linked to a multiple of salary.
• National Minimum Wage compliance. This sets a bottom limit beneath which salary sacrifice can’t operate.

Taking the time to document arrangements properly and model outcomes in advance can help avoid unintended consequences.

What should you do now?

Although the new rules do not take effect until 2029, pension planning is inherently long-term. Employers and individuals may wish to:

1. Review existing salary sacrifice arrangements and employment contracts.
2. Model the future NIC impact where contributions exceed £2,000.
3. Confirm whether pension contributions are genuinely salary sacrifice or standard employer contributions.
4. Revisit remuneration strategy for directors and key staff.

How THP can help you

The ways in which employment contracts, pensions and National Insurance can affect each other can be complex.

Whether you are an employer reviewing salary sacrifice arrangements, a director planning long-term pension contributions, or an employee assessing the impact of the £2,000 cap, our team is here to help you. To discuss any aspect of tax planning, please get in touch with a member of our friendly, expert team today.

Further information:

• HMRC Employment Income Manual: EIM42750 & EIM42760
• National Insurance Contributions (Employer Pensions Contributions) Bill
• ICAEW: What are salary sacrificed pension contributions?